I have a MBL 3TB. I tried installing transmission using apt-get. During installation it replaced the ssh server, installed apache, etc. All this lead to the following:
now the system doesn't boot porperly, the led remains whitish, won't reach green. Can't ssh into it anymore and can't access the web UI either.

Here is how far I got trying to fix it:
I disassambled it, took it out of the case and connected the hard disk to my laptop (runing Ubuntu 11.10) via a SATA->USB converter.
Here comes the problem. sudo blkid doesn't see the device at all. sudo fdisk /dev/sdb does see it. It says
WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.